Expander for finger rings



Nov. 11, 1 1,515,563

N. R. FELLENCER EXPANDER FOR FINGER RINGS Filed Aug. 29. 1923 gvwenfoz 7Zwwwz 7i FeZZazww;

Patented eases NORMAN R. FELLENGEB, OF ALLENTGWN, PENNSYLVANIA.

EXIPANDER FOB, FINGER RINGS.

Application filed August 29, 1923.

To all whom it may concern:

Be it known, that I, lblORItL-LN R. FELLEBF one, residing at Allentown, in the county of Lehigh and State of Pennsylvania, have in vented certain new and useful Improvements in Expanders for Finger Rings, of which the following is a specification.

This invention relates to jewelers tools, and has special reference to an expander for finger rings.

It is Well known that frequently rings require expanding on account of being of too tight fit, and this has been commonly accomplished by driving the ring down on a frusto-conical stake or mandrel having ring sizes marked thereon at intervals of its length. Ordinarly, in doing this, the ring has been slipped on the mandrel and driven down by means of a hammer and blunt tool, the operator delivering his blows around the ring in the same manner that a cooper puts a hoop on a cask or barrel.

The most important object of the present invention is to provide an improved and novel tool for use in connection with such a mandrel wherein the ring may be driven down along the mandrel by percussive pressure exerted Simultaneously on all sides of the ring.

A second important object of the invention is to provide a device of this character so constructed and arranged that a limit may be placed on the extent to which it may pass over the frusto-coincal expanding mandrel.

With the above and other objects in view as will be hereinafter described, the invention consists in general of certain novel details of construction and combinations of parts hereinafter more fully described, illustrated in the accompanying drawings and specifically claimed.

In the accompanying drawings like characters of reference indicate like parts in the several views, and:

Fig. 1 is a side elevation of the improved tool showing its relation to an ordinary expending mandrel.

Fig. 2 is a section on the line 2-2 of Fig. 1.

Fig. 3 is a section on the line 3-3 of Fig. 2.

Fig. 4 is a detail perspective view of a small tool used in connection with this device for moving a certain retaining ring or sizing ring used herewith, and also for loos Serial No. 659,908.

ening the finger ring from the mandrel after the stretching operation.

The invention itself formed from a bar of round steel which is drilled from one end to provide a bore 10 which. stops short of the other end, and thus provides a solid head 11. The open end of the device is then slit as at 12 to provide a series of fingers 13 which are fiared outwardly at their lower ends as indicated at 14:. It is preferred that the material. used be spring steel so that these fingers will have a very considerable amount of resiliency. On this body of the device is fitted a sliding ring 15, which acts as a sizing ring, the flaring portions 14 moving together as a ring is forced downwardly toward the open end. The open end is squared off, as at 16, and it is preferred that the top be bevelled as at 17 so that hammering blows will not tend to spread this top and make projecting fins. This invention is used in connection with an ordinary frustoconical expanding mandrel 18 having the usual ring size indicia 19 thereon.

In using the device, a finger ring such as is shown in dotted lines at R is dropped on the mandrel. The driving tool is then slipped on the mandrel until its lower end 16 coincides with the ring, the ring 15 being then slipped down to keep the lower ends of the fingers in this position. After the ring R is placed on the mandrel, the tool having been adjusted as described, in contact with the ring R, by a series of hammer blows on the head 11, the ring R is driven down on the mandrel. When the proper size has been reached, the flared end of the driving tool will wedge on the mandrel and be prevented from further down ward movement. The driving tool may then be removed, and as it will he usually found that it has gripped too tightly for manual removal, the tool 20 shown in Fig. 4 has its arcuate end 21 placed beneath the ring 15 and its flat end 22 struck to drive the ring 15 upward. This will release the spring fingers and enable the driving tool to be readily removed. The tool 20 may then be used for removing the ring R.

There has thus been provided a very simple and elficient device of the kind described and for the purpose specified.

Having thus described the invention, what is claimed as new, is:

1. A driving tool for expanding finger rings on tapered mandrels comprising a tubular member split at one end to provide :1 series of independent fingers adapted to surround a fingered mandrel and engage e finger ring thereon, the upper 1' :rt of said tubular member being closed to provide :1 solid head.

2. A driving tool for expanding finger rings on tape-red inandrels comprising a tubular member split at one end to provide 2. series of independent adapted to surround a tapered mandrel and engage a finger ring thereon. the upper part of said tubular member being closed to provide a solid heech and a sizing ring fitted on the tubular member and movable thereelong.

3. A tool of the class described comprisinn a bar of. spring meta-l drilled from one end to a point adjacent the other end and slotted from the first inei'itioned end to a pointadjaeeni the hetzom oi"? she drilling vhereb to provide a series or spring fingers, the extremities of said spring fingers being flared outwardly, and a sizing ring fitted on the tool and movable therealong to force said spring fingers inwardly toward each other.

In testimony whereof I my signature in presence to two Witnesses.

NORh IAN R FELLENCER. m itnesses Fmrtons V. HAnnrs, CATHERINE F. Honoxc. 

